Year	Total
1990	10670000000
1991	12110000000
1992	12000000000
1993	15430000000
1994	16010000000
1995	16120000000
1996	16510000000
1997	17470000000
1998	17060000000
1999	15570000000
2000	16300000000
2001	16340000000
2002	16300000000
2003	16300000000
2004	13630000000
2005	14190000000
2006	14060000000
2007	13940000000
2008	14100000000