68% (1993)

69% (2018)

65% (2015)

52% (2006)

59% (2003)

56% (2006)

66% (2019)

71% (2015)

57% (2007)

53% (2001)

61% (1996)

60% (2011)

66% (1988)

62% (2004)

58% (2006)

60% (2004)

53% (2010)

59% (1989)

57% (2002)

61% (2001)