Year	% of total employment
1997	17.112250122344687
1998	18.81892827546351
1999	20.34492488821753
2000	19.859500077079886
2001	20.076072450691427
2002	17.840209917315605
2003	18.718559750870615
2004	19.18766623316435
2005	18.647512332201142
2006	18.597918296856786
2007	18.349556516690722
2008	18.502034081424345
2009	20.262377608619907
2010	20.01071647594723
2011	19.50089146100887
2012	20.90629457168403
2013	21.715159533780046
2014	21.1992387864085
2015	21.611751918326803
2016	20.051849903871574
2017	21.389186361036217
2018	22.452351388866038
2019	22.47017939691653
2020	25.72328588976291
2021	20.432082996821403
2022	20.758286942433898
2023	21.694280463559714