Year	Index (Units)
1980	7.879
1981	9.401
1982	10.692
1983	11.718
1984	12.997
1985	14.327
1986	14.937
1987	16.364
1988	18.586
1989	21.104
1990	25.986
1991	29.747
1992	39.762
1993	61.512
1994	65.579
1995	70.097
1996	72.296
1997	79.386
1998	80.958
1999	89.462
2000	100.000
2001	101.602
2002	105.917
2003	114.761
2004	134.365
2005	140.965
2006	151.277
2007	159.750
2008	184.476
2009	199.263
2010	208.248
2011	247.677
2012	255.603
2013	273.875
2014	290.359
2015	313.608
2016	333.521
2017	348.515
2018	368.417
2019	394.785
2020	416.962
2021	440.832
2022	480.789
2023	512.695
2024	544.423
2025	572.927
2026	602.876
2027	633.251
2028	664.913
2029	698.159