Year	Number
1992	310.09792626728114
1993	297.5917431192661
1994	284.2524161455372
1995	281.81613085166384
1996	268.60660324566317
1997	257.4146614437605
1998	244.7163515016685
1999	232.5165562913907
2000	229.08593322386426
2001	221.87669010275823
2002	218.09549647314162
2003	216.260162601626
2004	215.2173913043478
2005	214.4735406437534
2006	209.8901098901099
2007	203.0735455543359
2008	197.60571114772102