Year	% of total primary
1997	41.9423484802246
1998	43.5622406005859
2002	46.5056114196777
2004	50.166259765625
2005	51.0707702636719
2006	52.9295806884766
2007	54.8618583679199
2008	56.628101348877
2009	57.9616203308105
2010	58.0295486450195
2011	59.0960311889648
2012	60.2141189575195
2013	60.8326988220215
2014	61.5134887695312
2015	62.089298248291
2016	62.7142601013184
2017	62.8188209533691
2018	62.5961608886719
2019	62.632511138916
2020	63.036548614502
2021	63.0461082458496
2022	62.9438514709473