Year	% of children ages 12-23 months
1980	9.153773577476429
1981	16.915138646469057
1982	19.590345003424847
1983	31.517068976853746
1984	35.45395648091137
1985	40.38113979104441
1986	45.25208288790891
1987	49.18869841225156
1988	52.65272708798267
1989	57.26622469405045
1990	59.23386172576529
1991	53.852713735277874
1992	53.90161048438653
1993	56.312637876024596
1994	61.13673400356401
1995	58.08466672955992
1996	59.76517876997769
1997	59.046837720924856
1998	56.99229807985145
1999	53.58816537070962
2000	57.68749497228199
2001	58.06295489854391
2002	59.99886996155457
2003	61.63824097022404
2004	63.424009942645064
2005	63.56066769174469
2006	66.56850784247479
2007	70.2068405817474
2008	70.69561863232491
2009	73.38480914703534
2010	75.93223731618738
2011	76.17639582816066
2012	77.14324110349799
2013	75.81365992265404
2014	76.11734278790631
2015	74.96538759574099
2016	73.32425891429807
2017	74.01455911743928
2018	74.07487103228081
2019	74.86177551699292
2020	73.24550100368235
2021	69.44770462332603
2022	70.70080826683699