CREATE TABLE table_76835 ("Name" TEXT, "Took Office" TEXT, "Left Office" TEXT, "President" TEXT, "Party" TEXT)

What is Left Office, when Party is Vacant (1999-2001)?
SELECT "Left Office" FROM table_76835 WHERE "Party" = 'vacant (1999-2001)'
SELECT "Left Office" FROM "table_76835" WHERE "Party" = 'vacant (1999-2001)'