Year	%
1997	2.586206896551724
1998	2.0905923344947737
1999	4.6583850931676976
2001	2.9498525073746307
2002	3.1976744186046497
2003	2.7355623100303945
2004	3.58974358974359
2005	3.8560411311053997
2014	4.864864864864865
2015	5.675675675675675
2016	6.46900269541779
2017	7.277628032345014
2018	7.795698924731183
2019	7.774798927613941
2020	8.108108108108109
2021	7.7747989276139435
2022	8.75331564986738
2023	8.638743455497385