Year	% of children ages 12-23 months
1981	1
1982	1
1983	1
1984	1
1985	2
1986	4
1987	9
1988	16
1989	49
1990	69
1991	74
1992	66
1993	74
1994	84
1995	69
1996	77
1997	78
1998	77
1999	80
2000	82
2001	85
2002	83
2003	87
2004	99
2005	93
2006	94
2007	94
2008	96
2009	97
2010	94
2011	96
2012	94
2013	96
2014	97
2015	98
2016	98
2017	98
2018	98
2019	98
2020	98
2021	98
2022	98