| Year | Value | | 2004 | 0.71103105881633 | | 2003 | 1.431982485915 | | 2002 | 1.3606156214562 | | 2001 | 1.4088346879331 | | 2000 | 1.5272681657102 | | 1999 | 1.9781441860383 | | 1998 | 2.4603876515048 | | 1997 | 3.0908207416188 | | 1996 | 3.3829300356482 | | 1995 | 3.4927887583925 | | 1994 | 10.80612656187 | | 1993 | 5.2982174798002 |
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