Year	base year varies by country
1965	18.755696327430638
1966	20.070122370526132
1967	20.877424164528772
1968	21.87124405682846
1969	24.277366476143015
1970	27.025236343479257
1971	29.055611084791487
1972	31.311513832426158
1973	33.367107641871684
1974	37.58079642818476
1975	40.25362685189006
1976	42.886971350460165
1977	45.40324323452463
1978	38.36078998378494
1979	51.809144379255024
1980	58.336512376711305
1981	66.35448664157279
1982	72.88607156172013
1983	78.5486385253455
1984	85.49208068820812
1985	90.3228828251216
1986	98.83391835440605
1987	100.5169461744236
1988	103.08941629710485
1989	104.86093775302763
1990	100
1991	103.63040905647243
1992	106.57529093735843
1993	109.4691115551343
1994	112.63462297326285
1995	114.13438790467471
1996	115.75769631599144
1997	118.14051784701986
1998	133.29937960989355
1999	141.45065920766567
2000	149.8835520817074
2017	100
2018	99.22557219220009
2019	101.6407991035894
2020	102.07798157078554
2021	107.00594223481579
2022	111.12108574363857