30% (1989)

43% (1984)

50% (2008)

30% (1991)

54% (2004)

60% (1997)

54% (1988)

69% (2007)

45% (1999)

15% (1991)

27% (2009)

53% (2012)

25% (2001)

15% (1982)

69% (1998)

45% (1990)

40% (2010)

50% (1996)

62% (1985)

48% (2009)