51% (1990)

60% (2005)

68% (1992)

79% (2009)

55% (2003)

59% (1992)

72% (2018)

45% (2006)

48% (1999)

38% (2000)

51% (2008)

38% (2005)

57% (1981)

43% (1999)

45% (2000)

70% (2008)

53% (2003)

71% (2020)

64% (1970)

30% (2015)