user: Question: Which Year is the lowest one that has a US Cham Rank smaller than 1?
Columns: ['Year', 'US Cham. Rank', 'US Cham. Spending', 'Next Highest Spender', 'Next Highest Amount']
Types: ['real', 'real', 'text', 'text', 'text']
Sample row: [2012.0, 1.0, '$136,300,000', 'National Assn of Realtors', '$41,464,580']
SQL:

assistant: SELECT MIN("Year") FROM "Table" WHERE "US Cham. Rank" < 1.0;