Year	Index (Units)
1992	19.995
1993	20.953
1994	23.707
1995	26.548
1996	29.279
1997	30.374
1998	33.249
1999	36.041
2000	43.230
2001	49.553
2002	57.916
2003	71.045
2004	88.884
2005	100.000
2006	107.707
2007	117.841
2008	143.964
2009	192.698
2010	212.540
2011	225.051
2012	238.633
2013	253.604
2014	274.805
2015	353.078
2016	333.387
2017	289.028
2018	247.405
2019	250.622