Year	Index (Units)
1990	15.230
1991	17.288
1992	21.014
1993	22.974
1994	25.744
1995	28.607
1996	31.097
1997	34.107
1998	36.364
1999	39.775
2000	43.838
2001	48.315
2002	54.459
2003	58.389
2004	60.804
2005	62.191
2006	65.277
2007	69.551
2008	75.876
2009	83.048
2010	87.097
2011	91.456
2012	97.604
2013	103.071
2014	108.583
2015	112.271
2016	119.823
2017	127.189
2018	132.650
2019	137.586
2020	140.626
2021	145.717
2022	154.571
2023	163.659
2024	171.533
2025	179.786
2026	188.436
2027	197.502
2028	207.004
2029	216.963