Year	Number
1994	154.1812446229
1995	153.9978423259
1996	153.814440029
1997	153.631037732
1998	153.447635435
1999	153.264233138
2000	153.0808308411
2001	154.1152853456
2002	150.8316604531
2003	147.5480355607
2004	144.2644106682
2005	140.9807857757
2006	141.395022783
2007	141.8092597903
2008	142.2234967976
2009	142.6377338049
2010	143.0519708122
2011	143.4662078195
2012	143.8804448268
2013	144.2946818341
2014	144.7089188414
2015	158.1301978778
2016	156.438199025
2017	168.9131058216
2018	168.9245770003
2019	168.9245770003
2020	168.9245770003