Year	base year varies by country
1980	4.287056323075665E-08
1981	4.197015014740998E-08
1982	4.197015014740998E-08
1983	4.1975507032029006E-08
1984	4.197600574718341E-08
1985	4.9966224802927456E-08
1986	4.54627380223814E-08
1987	4.992868432653944E-08
1988	5.103399278312557E-08
1989	5.9342154663101495E-08
1990	6.765447126973455E-08
1991	1.3957792768042213E-07
1992	8.046887378061643E-07
1993	8.18998894556242E-06
1994	0.00018640242482500092
1995	0.003589169647637395
1996	0.17588839434496445
1997	0.34377918240954897
1998	0.4790884282838863
1999	3.1500117486577612
2000	16.317659093602575
2001	33.671836371729704
2002	100
2003	193.9265669067308
2004	258.7825821332256
2005	368.4397585322956
2006	431.50067386319256
2007	450.0915878912213
2008	537.2553055960864
2009	447.19981755574673
2010	591.5132965956875
2011	779.445707940429
2012	836.0003391884369
2013	859.74044251697
2014	890.3548090137813
2015	859.0286958861697
2016	1046.0762890937833
2017	1282.6405474849232
2018	1643.923106627717
2019	1959.342696012248
2020	2170.228813228626
2021	3012.7924109136075
2022	3425.8416565676193
2023	4030.425864992498