Year	Age
1990	600
1991	600
1992	1400
1993	2000
1994	3000
1995	4400
1996	6200
1997	8200
1998	10000
1999	12000
2000	15000
2001	16000
2002	18000
2003	19000
2004	20000
2005	20000
2006	20000
2007	20000
2008	19000
2009	18000