Year	% of total primary
1970	0.166199997067451
1971	0.170880004763603
1972	0.175630003213882
1973	0.180270001292229
1974	0.179220005869865
1975	0.174319997429848
1976	0.168950006365776
1977	0.166539996862411
1978	0.167229995131493
1979	0.175520002841949
1980	0.1841000020504
1981	0.191090002655983
1982	0.192499995231628
1983	0.192310005426407
1984	0.190400004386902
1985	0.188020005822182
1986	0.188419997692108
1987	0.187230005860329
1988	0.186259999871254
1989	0.18588000535965
1990	0.217600002884865
1991	0.256260007619858
1992	0.382739990949631
1993	0.445470005273819
1994	0.548520028591156
1995	0.635710000991821
1996	0.725570023059845
1997	0.812950015068054
1998	0.876110017299652
1999	0.965380012989044
2000	1.04821002483368
2001	1.11898994445801
2002	1.3201299905777
2003	1.3954199552536
2004	1.4903199672699
2005	1.68241000175476
2006	1.84522998332977
2007	1.98985004425049
2008	2.17952990531921
2009	2.39625000953674
2010	2.56362009048462
2011	2.7388699054718
2012	3.06352996826172
2013	3.54630994796753
2014	3.92286992073059
2015	4.23368978500366
2016	4.49982023239136
2017	4.8374400138855
2018	5.13356018066406
2019	5.35895013809204
2020	5.5446400642395
2021	5.78076982498169
2022	5.75500011444092