33% (1998)

73% (2001)

58% (1990)

40% (2010)

23% (1981)

48% (1999)

60% (1984)

72% (1996)

73% (2003)

70% (1993)

66% (1988)

0% (1991)

44% (1993)

48% (2011)

0% (2005)

58% (2007)

10% (1993)

43% (1999)

35% (2005)

66% (2004)