Year	Total
1997	10160000000
1998	10160000000
1999	10290000000
2000	11340000000
2001	12570000000
2002	13500000000
2003	14510000000
2004	15340000000
2005	16220000000
2006	17620000000
2007	18580000000
2008	19400000000