Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_63614 ( "Rank" real, "Country/Region" text, "Expenditures on R&D (billions of US$ , PPP )" real, "% of GDP PPP" text, "Year" real )

### Question ###
What is the average expenditures on R&D for Croatia after 2007?

### Accurate SQL ###

SELECT AVG("Expenditures on R&D (billions of US$ , PPP )") FROM table_63614 WHERE "Country/Region" = 'croatia' AND "Year" > '2007'