69% (2025)

68% (2021)

68% (2011)

59% (2004)

58% (2014)

65% (2006)

59% (1998)

60% (2005)

54% (2009)

56% (2003)

58% (2006)

61% (2007)

55% (2000)

60% (2002)

54% (2005)

0% (1970)

0% (1970)