2013 – 52%
2001 – 70%
2012 – 66%
1992 – 64%
2000 – 68% **DVD**
2004 – 65% **DVD**
1982 – 75%
2001 – 61% **DVD**
2005 – 67% **DVD**
1983 – 67% **DVD**
1993 – 80%
1997 – 65%
2002 – 74% **DVD**
2008 – 54%
2015 – 64%
2018 – 76%
2001 – 61% **DVD**
2011 – 70% **DVD**
