1st January 1986 — 31st December 1996

61.3%

1st January 1987 — 31st December 1996

56.4%

1st January 1988 — 31st December 1996

50.1%

1st January 1989 — 31st December 1996

42.0%

1st January 1990 — 31st December 1996

32.0%

1st January 1991 — 31st December 1996

19.0%

1st January 1992 — 31st December 1996

14.3%

1st January 1993 — 31st December 1996

10.4%

1st January 1994 — 31st December 1996

8.4%

1st January 1995 — 31st December 1996

6.1%

1st January 1996 — 31st December 1996

2.1%

(all dates inclusive)