Year	Index (Units)
1980	26.836
1981	30.747
1982	29.380
1983	26.421
1984	23.613
1985	25.399
1986	19.330
1987	20.188
1988	18.497
1989	18.563
1990	30.272
1991	27.370
1992	28.361
1993	26.017
1994	26.148
1995	30.062
1996	32.626
1997	32.832
1998	25.335
1999	32.406
2000	48.643
2001	45.037
2002	46.563
2003	54.926
2004	59.542
2005	80.441
2006	82.492
2007	90.459
2008	114.110
2009	79.037
2010	91.108
2011	114.725
2012	121.987
2013	122.924
2014	121.101
2015	90.668
2016	82.530
2017	88.957
2018	100.000
2019	95.544
2020	81.116
2021	99.340
2022	125.319
2023	122.331
2024	125.300
2025	126.475
2026	127.569
2027	127.584
2028	128.869
2029	130.999