Year	% of children ages 12-23 months
1980	6.251368508880486
1981	12.061203522224773
1982	13.929321235149784
1983	20.8449315486214
1984	25.870126666172936
1985	32.55540032545602
1986	39.43295833253978
1987	43.794901567208214
1988	48.563875510308044
1989	55.13066681212172
1990	56.67963708803564
1991	53.4034680146803
1992	50.245422197873644
1993	51.07026184616561
1994	54.421848805522266
1995	54.03213720693831
1996	53.70183679077226
1997	53.28861941420782
1998	51.57535515305489
1999	49.813841200530426
2000	52.28295315543117
2001	52.46281812876708
2002	53.664360646969925
2003	56.198095711341225
2004	58.26455569082719
2005	60.09670372055463
2006	62.747247337122346
2007	64.63430989507668
2008	67.13482674813666
2009	71.28726208523027
2010	71.49396366655502
2011	70.07853130842653
2012	70.13110017740115
2013	69.06306633856408
2014	68.95882559886266
2015	68.15752714685678
2016	68.33325291987978
2017	69.89718018028483
2018	70.14416377269859
2019	71.04396586803331
2020	69.98129622604102
2021	68.27663805901558
2022	68.64351646775296