Year	%
1997	3.747161241483725
1998	3.457446808510639
1999	3.6167756829549806
2000	3.77068103116583
2001	4.621264767199441
2002	6.130931763075857
2003	6.048109965635739
2004	6.69304319155952
2005	7.036766496225965
2006	9.34959349593497
2007	9.753765240258197
2008	9.801577814965343
2009	9.902309058614565
2010	11.919671777153956
2011	11.328502415458932
2012	14.872042491549967
2013	17.36930860033727
2014	17.7934018388318
2015	18.77984084880636
2016	19.27561399156537
2017	18.884021212819935
2018	19.060773480663
2019	17.56653992395439
2020	19.546958513616715
2021	18.22454308093995
2022	18.24625886059333
2023	17.728237791932056