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Table in image replaced with wiki table
Table 2
Year
States With Primary Enforcement
Predicted States With Primary Enforcement
1984
1
3
1985
3
3
1986
6
4
1987
6
4
1988
6
5
1989
6
S
1990
7
6
1991
7
7
1992
7
7
1993
8
8
1994
8
9
1995
9
10
1996
10
11
1997
13
12
1998
14
13
1999
15
15
2000
17
16
2001
17
17
2002
18
19
2003
20
20
2004
21
22
2005
22
23
2006
26
25
2007
27
26
2008
27
28
2009
31
30
2010
32
31
2011
33
33
2012
33
34
2013
34
35
2014
34
37
2015
34
38
2016
34
39
2017
34
40
2018
34
41
2019
34
42
2020
34
43
2021
34
44
2022
34
45
2023
34
45
2024
34
46
2025
34
46
2026
34
47
2027
34
47
2028
34
48
2029
34
48
2030
34
48
2031
34
49
2032
34
49
2033
34
49
2034
34
49
2035
34
50
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