Table:
text: List of Grand Prix motorcycle racing World champions
By country
Grand Prix motorcycle racing World champions by country
Country MotoGP_500cc _350cc Moto2_250cc Moto3_125cc _80cc_50cc Total
Italy 20 8 22 23 2 75
United Kingdom 17 13 9 4 1 44
Spain 3 0 9 15 12 39
Germany 0 2 8 4 4 18
United States 15 0 2 0 0 17
Australia 8 1 1 1 0 11
Rhodesia 1 5 2 0 0 8
Japan 0 1 3 4 0 8
Switzerland 0 0 0 4 4 8
South Africa 0 3 2 0 0 5
France 0 0 3 2 0 5
New Zealand 0 0 0 2 2 4
Venezuela 0 1 2 0 0 3

text: List of Grand Prix motorcycle racing World champions
By country
Grand Prix motorcycle racing World champions by country
Country MotoGP_500cc _350cc Moto2_250cc Moto3_125cc _80cc_50cc Total
Netherlands 0 0 0 0 3 3
San Marino 0 0 1 1 0 2
Sweden 0 0 0 2 0 2
Finland 0 0 1 0 0 1
Austria 0 0 0 1 0 1

Question: How many at least 350cc is the list of world champions in Grand Prix motorcycle racing by country?