1973
18.7
17.2
21.3
31.6
41.3
61.8
91.9
151
134
148
52.0
32.0
1974
24.1
20.1
17.5
22.6
22.4
32.6
78.8
152
83.5
51.0
30.1
22.8
1975
18.5
16.3
17.3
29.2
38.7
77.7
132
181
158
72.2
37.7
26.2
1976
20.0
17.8
14.6
20.2
25.4
34.8
61.8
126
101
43.4
26.8
67.1
1977
15.2
13.4
11.4
13.3
24.5
35.6
140
157
108
48.4
29.0
21.7
1978
16.8
14.3
15.8
25.9
55.3
52.4
70.2
171
115
54.8
32.6
24.8
1979
18.5
16.0
15.1
21.4
37.0
39.8
80.1
85.7
46.8
30.5
20.8
18.4
1980
14.1
12.1
14.6
22.3
29.0
54.2
162
181
128
56.0
31.4
22.4
1981
18.0
15.1
14.2
21.7
35.0
41.8
117
146
114
72.4
37.4
24.9
1982
19.1
16.9
21.1
30.1
50.0
84.7
86.8
132
137
54.1
32.5
24.1
1983
19.9
17.7
14.7
19.1
39.4
47.4
66.1
96.9
142
89.1
43.4
29.4
1984
22.4
18.3
18.5
19.7
29.8
42.9
84.6
101
125
48.4
29.4
21.8
1985
18.0
14.8
12.9
16.2
19.4
25.2
81.3
122
112
104
46.3
30.2
1986
24.1
18.2
16.1 
22.1
26.5
51.6
122
127
73.3
46.9
30.1
23.4
1987
17.8
16.0
14.2
18.7
34.6
44.6
73.8
76.5
79.5
43.2
28.1
21.2
1988
16.6
14.9
18.8
27.9
37.6
37.8
123
156
74.7
41.8
26.7
19.9
1989
17.3
15.1
14.2
16.6
25.5
27.7
67.9
110
89.1
48.6
28.6
21.3
1990
16.0
14.4
14.3
22.9
41.2
41.5
121
132
96.9
51.3
30.1
21.6
1991
17.7
15.3
20.1
33.4
53.4
51.1
81.1
137
110
50.3
28.3
21.1
1992
17.1
14.3
12.6
12.9
18.4
25.0
60.3
137
113
50.2
29.8
21.6
1993
17.4
15.4
15.0
26.4
46.4
48.5
71.3
76.4
96.6
39.1
26.8
19.1
1994
15.4
13.2
11.4
10.9
19.6
27.6
71.3
127
102
43.5
26.5
19.4
1995
16.2
14.8
14.9
19.0
37.2
35.7
72.4
1.02
63.4
31.0
22.9
17.2
1996
16.8
15.3
17.0
20.6
31.7
40.3
82.5
160
118
69.7
35..5
24.6
1997
19.8
13.6
14.0
16.3
17.6
30.6
60.5
64.9
57.9
30.9
27.2
23.3
1998
17.3
14.9
15.5
25.5
45.7
45.9
60.2
96.5
62.5
65.0
38.0
26.1
1999
14.3
17.2
14.0
13.7
13.6
33.6
80.5
141
114
85.4
39.9
27.1
2000
20.9
17.6
15.9
24.2
35.0
76.7
126
142
137
51.1
32.4
23.9
2001
18.1
14.7
12.5
15.7
30.8
74.7
129
79.7
93.2
47.2
27.8
20.1
2002
16.2
14.8
16.4
26.3
43.1
42.3
55.5
123
109
52.7
30.6
20.9
2003
16.3
14.4
14.2
22.9
27.3
37.5
88.8
141
139
71.8
34.4
23.5
2004
18.9
14.6
11.1
11.0
15.0
20.1
48.0
124
45.6
41.0
22.7
17.3
2005
21.3
18.1
17.8
18.1
24.4
36.3
94.7
138
94.4
59.4
32.6
22.1
2006
16.7
13.0
12.7
13.1
22.3
30.4
102
154
104
58.3
29.3
26.6













