Year	scale 1-100
1970	47.25
1971	47.35
1972	47.6
1973	48.425
1974	49.35
1975	49.35
1976	49.475
1977	49.475
1978	50.225
1979	50.35
1980	50.6
1981	50.6
1982	50.975
1983	50.975
1984	51.1
1985	51.325
1986	51.525
1987	51.725
1988	52.6
1989	52.95
1990	53.175
1991	53.7
1992	53.825
1993	53.825
1994	54.05
1995	55.05
1996	55.675
1997	56.375
1998	56.7
1999	57.625
2000	57.725
2001	58.2
2002	59.25
2003	59.9
2004	60.45
2005	60.65
2006	61.075
2007	61.575
2008	62.6
2009	63.25
2010	63.85
2011	64.675
2012	66.3
2013	68
2014	68.85
2015	69.15
2016	69.975
2017	70.075
2018	70.5
2019	70.85
2020	71.475
2021	71.95
2022	72.525
2023	72.95