61% (1990)

50% (2009)

46% (2008)

51% (2009)

50% (2012)

42% (2016)

43% (2016)

44% (2006)

41% (2007)

45% (2005)

38% (2009)

47% (2015)

47% (2010)

47% (2014)

50% (2009)

43% (2006)

41% (2006)

45% (2018)

49% (2014)

30% (2001)