Year	Total
1990	17200000000
1991	20000000000
1992	33100000000
1993	34800000000
1994	34790000000
1995	35970000000
1996	32900000000
1997	31330000000
1998	30970000000
1999	31800000000
2000	30130000000
2001	21600000000
2002	21760000000
2003	23110000000
2004	24230000000
2005	26070000000
2006	27680000000
2007	28260000000
2008	31100000000