77% (1991)

71% (1994)

69% (1999)

71% (1991)

71% (1989)

67% (1993)

70% (1996)

63% (2008)

71% (1995)

59% (1996)

54% (1994)

67% (1992)

72% (2021)

64% (2001)

55% (2003)

82% (2012)

60% (2004)