Year	% of total primary
1971	4.02476978302002
1972	3.12673997879028
1997	14.1767301559448
1999	18.0021991729736
2000	17.7898902893066
2001	20.3125
2002	17.9223194122314
2003	24.2541408538818
2004	24.1379299163818
2005	29.864860534668
2014	27.9561805725098
2018	43.1521682739258
2020	42.2406387329102
2021	41.1104507446289
2022	43.2225799560547