50% (2005)

59% (2002)

60% (2001)

61% (2003)

49% (2001)

62% (2021)

45% (2000)

60% (2001)

52% (1997)

62% (1995)

50% (1993)

50% (1998)

35% (1996)

46% (1987)

55% (1999)

59% (1990)