Year	Number
2000	1.1595808383
2001	1.2348802395
2002	1.3100673653
2003	1.3853106287
2004	1.4605538922
2005	1.5357971557
2006	1.6110404192
2007	1.6862836826
2008	1.7619760479
2009	2.0644526103
2010	2.3679770769
2011	2.6715015434
2012	2.97502601
2013	3.2785504766
2014	3.5820749431
2015	3.8855994097
2016	4.1891238763
2017	4.1262925219
2018	4.0634611677
2019	4.2267774746
2020	4.3586331976