Year	% of children ages 12-23 months
1980	5.276061126640163
1981	10.962348374511949
1982	11.800528872126032
1983	18.449065908593976
1984	24.49393644352784
1985	29.451124110864356
1986	34.36169693598915
1987	40.7799775989638
1988	44.33232968379916
1989	49.92591519313502
1990	56.08458342031661
1991	48.73535847504453
1992	49.070102910868194
1993	49.098526868832785
1994	53.50664542563031
1995	52.50859162507571
1996	50.19937457324117
1997	48.79936513113776
1998	49.452353229585896
1999	48.62676304242251
2000	51.325338439727254
2001	51.59762343489172
2002	52.916477315744984
2003	55.96418770056546
2004	59.06620864285168
2005	62.244133372427044
2006	64.2667351001433
2007	66.20101969809988
2008	69.29500597033615
2009	72.50000533188009
2010	71.01291606213346
2011	71.07918032724417
2012	70.17825023402906
2013	69.69543238479663
2014	71.01646416054747
2015	70.60882521278532
2016	73.38689875409979
2017	73.88335006225667
2018	75.28458313124293
2019	76.46043250072549
2020	73.96739398816501
2021	72.124277161481
2022	72.24604254144224