三十年前
19.9 18.7
22.8 20.2
25.5 22.4
29.7 25.2
34 27.9
37.9 30.8
42.6 34.2
47.7 38.9
52.9 44.3
58.4 50.1
62.3 54.8
64.8 57.5
65.3 58.9