1. 1998 - 50.00%
2. 2001 - 33.81%
3. 1994 - 33.65%
4. 1997 - 32.63%
5. 1995 - 32.38%
6. 1991 - 31.38%
7. 1987 - 30.83%
8. 2002 - 28.29%
9. 2004 - 27.80%
10. 1992 - 27.15%
11. 2011 - 25.56%
12. 2006 - 23.08%
13. 2008 - 21.37%
14. 1996 - 20.14%
15. 2000 - 19.58%
16. 2007 - 18.94%
17. 2003 - 18.65%
18. 2010 - 16.76%
19. 2005 - 15.79%
20. 1985 - 15.78%
21. 2013 - 15.65%
22. 1999 - 14.85%
23. 2016 - 14.70%
24. 1993 - 14.08%
25. 1990 - 13.59%
26. 2015 - 12.94%
27. 2009 - 12.04%
28. 1981 - 11.86%
29. 2014 - 11.38%
30. 2012 - 8.88%
31. 1988 - 7.82%
32. 1986 - 7.13%
33. 1989 - 6.57%
34. 1978 - 4.57%
35. 1979 - 4.54%
36. 1983 - 3.98%