Year	years
1999	3
2000	3
2001	3
2002	3
2003	3
2004	3
2005	3
2006	3
2007	3
2008	3
2009	3
2010	3
2011	3
2012	3
2013	4
2014	4
2015	3.5
2016	4
2017	4
2018	4
2019	4
2020	4
2021	4
2022	3
2023	3.5