48% (1992)

72% (2006)

56% (1988)

35% (1990)

40% (1993)

37% (1987)

53% (1995)

37% (1995)

35% (1995)

49% (1990)

49% (2007)

42% (2008)

52% (2003)

47% (2007)

37% (2006)

78% (2007)

46% (2006)

35% (2005)

40% (1987)

35% (1989)