1976 – 72%
1979 – 20% **DVD**
2008 – 52%
2003 – 53% **DVD**
1999 – 64% – **DVD**
1964 – 71%
1965 – 63%
1968 – 65%
1998 – 70% **DVD**
2000 – 42% **DVD**
2004 – 58% **DVD**
1938 – 75%
2004 – 59% **DVD**
2003 – 61% **DVD**
1982 – 54% **DVD**
2001 – 60% **DVD**
1999 – 63% **DVD**
