57% (1996)

43% (1998)

53% (2005)

48% (2010)

42% (2003)

57% (1998)

47% (1997)

45% (2000)

52% (1996)

52% (2013)

43% (2007)

24% (1995)

39% (2001)

45% (2009)

55% (1999)

35% (2004)

34% (1996)

40% (2001)

52% (1993)

44% (2002)