1996
1997
1998
1999
Total
80
120
250
620
1,060
10
20
90
70
140
280
1,560
30
60
400
570
40
130
370
660
50
200
940
..
100
190
710
1,070
260
410
180
240
500
790
830
1,260
110
170
1,110
350
690
1,170
2,040
6,640
10,540