The charts/pies below show the frequency of reports sent to Bite Back Magazine http://www.directaction.info/ during 2003-2007 in quarters, months and also by countries.
click on thumbnails below to enlarge
Similarly, November 2007 had one the most reports to date in a month, totally 58 - which equals that of August 2005. Although since then it has been noted that January 2008 has beaten this record with 61 reports. 
Other than the information above, it's difficult to put into place which countries are the most active, as for example Sweden are doing more ALF actions than any other country these days, with the last few months seeing the bi-monthly reports totally over a douzen actions each on average. Swedish activists totalled 33 actions in the month of January this year, scoring more than any other country. 
So just to clear up, the UK are no longer "leading the way" despite recording on average 100 reports every year, as it seems Sweden's ALF Support Group are reporting many more actions through 'Action Reports'.
Moving on; Italian activists may only have a tendency to send in 30-50 reports every year, but a small handful of these will include half a douzen to twenty actions each - namely against Zoolandia. The national group who focus on the direct action in Italy have even dedicated a page to the activists fighting the chain of pet stores. 
So despite what's been said above, can anything be said about whether the amount of ALF actions have increased across the globe?
No. of countries with established ALF cells:
2002 // 22 - Netherlands(?)
2003 // 25 - Portugal(?), Russia(?), Scandinavia(?)
2004 // 27 - Argentina, Turkey
2005 // 29 - Canary Islands, Brazil
2006 // 36 - Chile, Czech Republic, Iceland, Estonia, Mexico, Slovakia
2007 // 37 - Romania
2008 // 40 - Belarus, Malaysia, Greece
Compared to 1970s-1980s and 1990s.
1970s // 3 // UK (1976), Holland (1977), USA (1979)
1980s // 16 // Canada, France, Germany (1981), Switzerland, Argentina (1982), New Zealand, South Africa (1983), Ireland, Denmark (1984), Sweden (1985), Austria, Italy, Spain (1987)
1990s // 21 // Israel (1992), Poland (1994), Finland (1995), Norway (1996), Belgium (1998)
Although only Romania made an appearance in December 2007 making themselves the ALF's 37th country; Belarus, Malaysia and Greece have had their first actions noted in January 2008. This means that there have been 15 new countries become active since 2003, with 40 countries in total.
Considering the ALF started in 1976, with 20+ countries active 25 years later by 1998; it is clear that within a decade following there has been twice as many countries sign up to the cause for animal liberation. Or another way or looking at it, there have been 3 times more countries become involved in the last 10 years, than the ten before.
The following countries the Animal Liberation Front or underground actions for animal liberation have taken place are:
Canary Islands (2005)
Czech Republic (2006)
New Zealand (1983)
South Africa (1983)
(****)? = First recorded action is not possibly the first known action.
For more information on national campaigning/direct action groups visit:
Timeline of (main) direct action cells:
1850s: Band of Hope --- formed from the RSPCA
1870s: Band of Mercy --- renamed from the Band of Hope
1964: Hunt Saboteurs Association (HSA) --- formed from the League Against Cruel Sport (LACS)
1973: Band of Mercy --- formed from the Hunt Saboteurs Association
1976: Animal Liberation Front (ALF) --- formed from the Band of Mercy
1982: Animal Rights Militia** (ARM)
1994: Justice Department**
1986: Hunt Retribution Squad** (HRS)
2003: Revolutionary Cells--Animal Liberation Brigade** (RCALB)
2004: Lobster Liberation Front (LLF)
2005: Oxford Arson Squad
2006: Huntingdon Hate Squad (ALF)
2007: Agenda 21
2007: Cat and Dog Liberation Army
**Groups that openly advocate and carry out violence. (4)
Please bare in
mind, the accuracy is limited due to;