Year	% of total primary
1999	94.7198867797852
2000	94.1644515991211
2001	94.111213684082
2002	94.1669692993164
2003	94.4270782470703
2004	95.0817565917969
2005	95.6899490356445
2006	96.6118774414062
2007	95.903678894043
2008	95.9950103759766
2009	96.958122253418
2010	97.2044525146484
2011	97.2798004150391
2012	97.390266418457
2013	97.6879119873047
2014	97.6773681640625
2015	97.7074127197266
2016	97.806022644043
2017	97.8162994384766
2018	97.7592926025391
2019	97.679069519043
2020	97.4411773681641
2021	97.066291809082
2022	96.7872619628906