Countries (number of stations) 1992 2000 2011
Luxembourg (3) 4.9129 4.8385 5.5878
United Kingdom (159) 4.6629 4.4511 4.2891
Belgium (27) 4.7057 4.7389 3.382
Denmark (38) 7.8484 4.9621 3.1548
Germany (138) 4.1585 3.4264 3.0607
Czech Republic (66) 3.9559 3.1985 2.8971
Poland (95) 1.9235 2.0776 2.0339
France (188) 2.1614 2.3833 1.9181
Austria (47) 2.0894 1.7494 1.8996
Spain (25) 1.0062 1.4029 1.772
Slovakia (18) 2.0578 1.8268 1.7238
Turkey (5) 1.6
Bulgaria (79) 2.6731 2.1606 1.543
Latvia (21) 1.6905 1.089 1.5052
Lithuania (27) 1.8919 1.5955 1.4731
Estonia (53) 1.4628 1.3228 1.3508
FYR Macedonia (19) 1.099 1.314
Switzerland (6) 1.3924 1.17 1.2502
Portugal (29) 1.242
Ireland (3) 1.2799 1.2731 1.1281
Romania (118) 1.092
Slovenia (14) 1.1226 1.0303 0.9944
Liechtenstein (12) 1.5067 1.3158 0.9522
Serbia (76) 0.865
Cyprus (7) 1.952 0.851
Croatia (38) 0.724
Kosovo under UNSCR 1244/99 (44) 0.718
Albania (6) 0.429 1.4511 0.6478
Bosnia and Herzegovina (12) 0.545 0.603
Sweden (108) 0.7467 0.6057 0.5044
Finland (84) 0.2981 0.4002 0.385
Norway (10) 0.2975 0.2518 0.2169
Iceland (1) 0.043 0.06