1965
18.9
20.9
20.9
25.4
25.9
38.0
68.9
76.5
58.3
35.3
27.4
20.8
1966
17.6
16.9
16.9
16.9
21.3
42.1
89.0
117
72.9
38.7
25.7
20.8
1967
18.9
15.0
13.4
16.8
20.5
31.0
98.3
120
80.4
45.6
32.9
28.8
1968
23.6
21.9
23.6
26.4
30.7
50.0
87.2
110
76.5
47.4
34.2
29.1
1969
25.4
22.7
22.7
24.1
32.2
47.30
166
111
99.6
54.2
35.9
27.3
1970
23.4
21.5
22.3
26.7
25.2
44.6
130
162
44.4
38.6
33.8
33.80
1971
21.0
20.4
23.2
27.7
29.4
160
166
182
138
73.2
50.0
40.3
1972
32.9
30.5
28.4
32.0
43.4
44.9
130
141
132
47.8
31.9
25.5
1973
21.9
20.5
21.6
22.0
25.4
73.6
109
155
125
79.8
35.3
24.5
1974
21.2
19.6
19.5
19.9
21.2
29.3
60.3
140
114
76.5
29.2
15.7
1975
14.4
12.0
14.6
17.4
19.3
53.7
135
123
137
52.9
29.2
19.8
1976
16.6
17.1
17.4
21.6
32.4
43.8
179
122
111
44.8
31.2
19.7
1978
20.2
17.0
15.5
14.9
19.1
77.9
223
208
134
72.5
29..8
22.6
1979
21.7
20.1
17.4
15.1
25.4
62.1
162
184
84.2
43.2
30.3
24.1
1980
19.5
17.3
17.6
22.1
29.3
53.3
103
136
94.6
46.7
32.9
26.0
1981
22.7
20.8
21.3
25.9
30.5
54.4
138
148
72.5
39.9
28.9
22.1
1982
20.0
18.7
20.1
21.1
22.6
44.2
85.4
140
87.4
36.7
27.0
20.1
1984 
19.8
18.3
18.4
18.0
22.7
66.5
98.8
99.2
80.6
49.7
25.3
20.9
1985
17.7
16.4
15.2
16.5
20.9
27.2
89.4
119
145
68.7
39.0
28.6
1986
22.8
18.9
17.9
21.7
32.4
42.3
122
122
73.4
42.0
28.6
50.3
1987
16.6
15.3
14.5
18.0
25.5
32.6
80.1
139
71.4
40.2
31.1
26.1
1988
22.8
20.4
23.0
24.8
29.3
36.6
84.7
93.4
53.7
41.5
30.1
25.0
1989
23.8
21.6
20.4
22.2
23.5
34.1
93.4
121
86.2
45.9
22.6
23.4
1990
18.9
17.3
19.6
26.3
38.5
43.4
97.7
145
86.5
53.2
30.7
22.3
1991
18.8
16.8
19.1
21.8
27.9
35.1
71.0
116
82.7
37.6
25.3
20.0
1992
18.9
17.8
16.2
17.4
19.9
21.5
33.7
87.4
112
60.6
31.5
23.2
1993
18.4
17.5
17.5
22.0
28.37
37.8
61.4
83.5
93.0
44.3
27.5
22.2
1994
19.3
18.3
18.0
17.9
23.3
33.5
85.5
114
77.6
35.4
25.6
20.7
1995
19.0
17.9
19.4
23.9
29.2
34.0
99.4
208
134
47.9
30.6
23.5
1996
20.0
18.4
20.1
23.6
27.1
50.7
134
202
145
60.2
33.3
24.2
1997
23.3
20.1
18.1
21.3
24.2
35.0
108
146
132
52.5
31.5
27.0
1998
21.0
17.9
19.0
29.9
40.8
55.7
154
270
134
75.0
44.8
32.0
1999
25.7
22.1
20.8
23.3
24.7
54.8
178
185
135
82.7
42.9
30.1
2000
23.7
22.0
22.0
30.8
43.9
94.3
175
199
135
53.6
33.4
24.2
2001
20.1
17.3
16.7
20.0
32.0
69.1
184
173
91.7
49.9
33.2
25.1
