Year	Number of
1990	25260
1991	25800
1992	26320
1993	26820
1994	27300
1995	27750
1996	28160
1997	28540
1998	28890
1999	29220
2000	29540
2001	29850
2002	30150
2003	30450
2004	30750
2005	31040
2006	31340
2007	31620