Year	% of total employment
1997	14.35
1998	17.69
1999	22.98
2000	21.87
2001	24.47
2002	22.65
2003	23.03
2004	23.15
2005	22.49
2006	22.15
2007	21.94
2008	22.05
2009	23.02
2010	23
2011	23.61
2012	23.49
2013	24.46
2014	23.22
2015	22.49
2016	22.08
2017	22.78
2018	25.68
2019	25.66
2020	28.72
2021	19.64
2022	20.67
2023	20.62