Admissions at the Bettendorf Isle of Capri Casino in March continued a decade long decline for the riverfront gambling operation, off more than 40 percent since 2001. Ten years ago, the riverboat drew 177,745 gamblers during March, providing the Isle with $9.2 million in revenues. Last month, the boat had 101,000 admissions and $6.7 million in revenue. The Isle's best March was 2000 when 183,640 gamblers visited the casino.