Year	% of children ages 12-23 months
1980	5.2754428564773725
1981	10.962581152253636
1982	11.805357114053752
1983	18.45694338028973
1984	24.500512351624124
1985	29.456496401820136
1986	34.367255993473094
1987	40.78434798371171
1988	44.336696881320535
1989	49.929908338149836
1990	56.0881392829031
1991	48.73927548798552
1992	49.0737980972004
1993	49.102120857838635
1994	53.50983689261508
1995	52.5119621632107
1996	50.20284908125314
1997	48.80283530400735
1998	49.45570473465367
1999	48.62981147451067
2000	51.328089248424305
2001	51.60021996791791
2002	52.919087525801345
2003	55.966562179803866
2004	59.06841031668345
2005	62.246120041748256
2006	64.2686304108895
2007	66.20279296979228
2008	69.29658591347606
2009	72.50144597551191
2010	71.01444752947245
2011	71.08062227641648
2012	70.1796592208228
2013	69.69690582029223
2014	71.01787126418327
2015	70.61009093097891
2016	73.3879756474397
2017	73.884466530351
2018	75.28573589263493
2019	76.46150586994196
2020	73.96845079260147
2021	72.12524351127644
2022	72.24709689315128