Year	Index (Units)
1987	0.966
1988	1.694
1989	2.016
1990	4.955
1991	10.272
1992	18.017
1993	37.368
1994	36.819
1995	41.239
1996	42.489
1997	45.041
1998	49.706
1999	50.333
2000	48.361
2001	51.455
2002	52.481
2003	54.198
2004	58.264
2005	62.935
2006	67.213
2007	72.994
2008	81.598
2009	82.211
2010	87.362
2011	91.687
2012	94.106
2013	96.806
2014	100.000
2015	103.069
2016	104.698
2017	106.872
2018	110.951
2019	114.049
2020	113.109
2021	116.102
2022	120.183
2023	123.992
2024	127.532
2025	131.119
2026	134.914
2027	138.856
2028	142.910
2029	147.058