2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | |
引入政策变化的国家数量 | 40 | 46 | 54 | 51 | 57 | 60 | 41 | 49 | 59 | 65 | 55 | 54 | 67 |
监管政策 | 68 | 89 | 116 | 86 | 92 | 87 | 74 | 100 | 125 | 144 | 112 | 107 | 152 |
自由化/促进 | 51 | 61 | 77 | 62 | 65 | 63 | 52 | 75 | 84 | 98 | 65 | 66 | 72 |
限制/监管 | 15 | 24 | 33 | 21 | 21 | 21 | 12 | 14 | 22 | 23 | 31 | 21 | 50 |
中性/待定 | 2 | 4 | 6 | 3 | 6 | 3 | 10 | 11 | 19 | 23 | 16 | 20 | 30 |