Year	Index (Units)
1990	59.743
1991	65.462
1992	70.851
1993	83.142
1994	94.825
1995	103.683
1996	108.788
1997	110.534
1998	108.057
1999	104.058
2000	100.000
2001	108.453
2002	107.895
2003	113.098
2004	124.405
2005	130.528
2006	139.289
2007	145.939
2008	168.404
2009	171.304
2010	182.132