*Excludes Observations that spanned multiple years

Pre 19700
19702
19710
1972189
197352
19740
19750
19760
19770
19780
19790
19802
19810
19820
19830
198461
198527
1986103
1987193
1988277
1989158
1990132
1991252
1992110
199394
19948
199543
199610
199741
199832
199981
2000142
200191
200248
200345
200439
200564
200635
200745
200851
200951
201066
201192
201291
2013100
201497
201590
201683
201784
20180
20190
Total3181