Year	% of children ages 12-23 months
1983	15
1984	26
1985	35
1986	39
1987	45
1988	51
1989	58
1990	71
1991	74
1992	76
1993	78
1994	80
1995	83
1996	84
1997	83
1998	82
1999	83
2000	84
2001	85
2002	86
2003	87
2004	88
2005	87
2006	89
2007	90
2008	89
2009	89
2010	89
2011	89
2012	91
2013	90
2014	91
2015	91
2016	90
2017	90
2018	90
2019	92
2020	94
2021	94
2022	94