Table: rd_spending
Columns: rank
country_region
expenditures_on_r_d_billions_of_us_ppp
of_gdp_ppp
year

Question: What is the average expenditures on R&D for Croatia after 2007?
SQL: SELECT AVG("expenditures_on_r_d_billions_of_us_ppp") FROM rd_spending WHERE "country_region" = 'croatia' AND "year" > 2007

Question: What is the lowest expenditures on R&D for Poland after 2011?
SQL: SELECT MIN("expenditures_on_r_d_billions_of_us_ppp") FROM rd_spending WHERE "country_region" = 'poland' AND "year" > 2011