user: Question: how many total where last/current driver(s) is Narain Karthikeyan ( 2010 )
Columns: ['Country', 'Total', 'Champions', 'Current', 'First driver(s)', 'Last/current driver(s)']
Types: ['text', 'real', 'real', 'real', 'text', 'text']
Sample row: ['Argentina', 1.0, 0.0, 0.0, 'Esteban Guerrieri ( 2009 )', 'Esteban Guerrieri ( 2010 )']
SQL:

assistant: SELECT SUM("Total") FROM "Table" WHERE "Last/current driver(s)" = 'Narain Karthikeyan ( 2010 )';