Year	% of children ages 12-23 months
1980	0.9515824774969366
1981	4.3592273941976005
1982	5.172401961340362
1983	12.15879927722841
1984	27.251674881811063
1985	34.549432609834014
1986	40.76461643760902
1987	45.075147055848205
1988	50.651543425732626
1989	56.82725932617723
1990	56.35942193092727
1991	57.65802203244474
1992	54.67213346289459
1993	52.6925989131975
1994	53.003706047822185
1995	52.88548494767121
1996	51.422070389035284
1997	52.18731854133512
1998	54.01175377528048
1999	52.406931929221834
2000	52.42082443353574
2001	52.54381396181206
2002	52.18795754241322
2003	54.32332365218293
2004	55.94328319114671
2005	56.4237977189456
2006	57.813249716802474
2007	56.07108551415651
2008	61.682857846296216
2009	65.50811919367901
2010	63.40191025440003
2011	61.4869995464729
2012	61.109780418697476
2013	63.20809919310937
2014	64.47599030710494
2015	64.6561594789026
2016	66.81429217216208
2017	68.4319116604225
2018	69.76762271251977
2019	71.2948596734852
2020	72.9381587789638
2021	72.26423665553173
2022	72.90226738418866