Year	% of total employment
1997	19.16
1998	21.9
1999	20.07
2000	25.32
2001	22.19
2002	17.97
2003	20.88
2004	16.18
2005	14.61
2006	14.66
2007	14.57
2008	15.22
2009	27.92
2010	25.3
2011	21.77
2012	24.94
2013	26.8
2014	27.1
2015	27.95
2016	25.61
2017	26.11
2018	29.22
2019	29.65
2020	32.57
2021	32.34
2022	33.41
2023	33.19