69% (1987)

62% (2019)

63% (1993)

68% (2006)

65% (2007)

70% (1997)

57% (2008)

68% (1998)

69% (2009)

56% (2017)

61% (1997)

52% (2005)

60% (2009)

48% (2001)

62% (2004)

54% (1998)

61% (2003)

63% (1988)

73% (1996)

57% (2013)