Year	base year varies by country
1970	6.342789346051628
1971	6.668990264377264
1972	7.1039241252000025
1973	7.68383630817351
1974	8.807416115005287
1975	10.293441391049493
1976	11.52575451385288
1977	13.084268618794953
1978	14.135359639092373
1979	15.36767270942975
1980	17.034920447264984
1981	18.520945270583166
1982	20.51439351798586
1983	22.797797605440483
1984	23.70391045890463
1985	25.262424660805767
1986	27.400850605138753
1987	29.937966306214868
1988	32.07639265641458
1989	34.50477476116062
1990	38.85237663920131
1991	44.453512563967166
1992	52.732503158848274
1993	58.591652088836874
1994	56.50118254416099
1995	57.50017090511348
1996	59.831350258149584
1997	63.49439856496654
1998	65.9920602716817
1999	70.43212504065501
2000	74.35288422984898
2001	78.3597495756577
2002	82.97134853083907
2003	87.62888946316306
2004	92.56180733162822
2005	93.43200740055508
2006	99.5702730030333
2007	77.6511134676565
2008	64.03985507246375
2009	96.86700767263433
2010	87.1803069053709
2011	92.89297658862881
2012	110.9143881667413
2013	100
2014	101.33779264214007
2015	92.54401724757474
2016	116.75293305728064
2017	134.90235814296176
2018	158.57487922705252
2019	151.2752482026699
2020	158.29120323559218
2021	185.6036909602747
2022	163.90079608083326
2023	175.8057160231077