*Excludes Observations that spanned multiple years

Pre 19709
19700
19710
197257
197317
19740
19750
19762
19770
19780
19790
19800
19810
19820
19830
198470
198518
198693
1987167
1988217
1989115
199050
1991113
199255
199346
199425
199567
199610
199735
199825
1999125
2000144
2001129
200241
200348
200457
200554
200631
200735
200834
200928
201056
201154
201258
201345
201452
201552
201655
201742
20180
Total2331