user: Question: What is the lowest expenditures on R&D for poland after 2011?
Columns: ['Rank', 'Country/Region', 'Expenditures on R&D (billions of US$ , PPP )', '% of GDP PPP', 'Year']
Types: ['real', 'text', 'real', 'text', 'real']
Sample row: [1.0, 'United States', 405.3, '2.7%', 2011.0]
SQL:

assistant: SELECT MIN("Expenditures on R&D (billions of US$ , PPP )") FROM "Table" WHERE "Country/Region" = 'poland' AND "Year" > 2011.0;