Year	Index (Units)
1980	2.532
1981	2.820
1982	2.958
1983	3.157
1984	3.258
1985	3.883
1986	5.156
1987	5.716
1988	6.304
1989	7.123
1990	9.828
1991	13.278
1992	14.638
1993	16.594
1994	18.670
1995	20.241
1996	22.478
1997	24.554
1998	26.178
1999	27.543
2000	29.189
2001	31.318
2002	33.863
2003	35.763
2004	38.471
2005	41.973
2006	44.728
2007	47.778
2008	53.206
2009	54.195
2010	56.286
2011	59.775
2012	62.047
2013	64.741
2014	66.955
2015	68.554
2016	71.603
2017	74.773
2018	77.576
2019	80.449
2020	83.033
2021	86.573
2022	92.531
2023	98.276
2024	102.231
2025	106.282
2026	110.523
2027	114.937
2028	119.572
2029	124.394