Year	% of births
2000	18.00840516
2001	18.0943556
2002	18.16987335
2003	18.248548
2004	18.33771357
2005	18.42107147
2006	18.49732243
2007	18.58213583
2008	18.6659032
2009	18.75783595
2010	18.84464852
2011	18.92596145
2012	19.00109996
2013	19.07830001
2014	19.1372328
2015	19.20144966
2016	19.2547046
2017	19.29522955
2018	19.33038843
2019	19.35636573
2020	19.38028308