Name Sites Samples
Russia 576 1622
Saudi Arabia 1 1
Serbia 4 3
Slovakia 40 70
Slovenia 10 38
Spain 389 1382
Sweden 265 1153
Switzerland 143 678
Tanzania 22 191
Turkey 10 80
Turkmenistan 1 0
Uganda 10 63
Ukraine 100 248
Ulster County 1 21
United Kingdom 1202 4709
United States 12492 51320
Uruguay 9 40
Ă…land Islands 1 6