*Excludes Observations that spanned multiple years

Pre 19707
19700
19717
19720
19730
19740
19750
19760
19770
19784
19792
19803
19810
19823
19830
19841
198519
198634
198784
1988187
19898
199018
1991180
199274
199354
199416
1995177
1996119
1997178
199812
199978
200045
200154
200230
20037
20042
20053
20060
200714
20087
200912
20103
20113
20122
20132
20142
20151
20162
20172
20181
20194
20205
20216
20227
20231
20240
Total1480