*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
1972133
197378
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
198416
19854
198665
198758
198874
198939
199069
1991129
199259
199343
19945
199515
199611
199713
19983
199923
200098
2001142
200233
20031
20041
20053
20061
20071
200812
20091
20105
20117
20121
20133
20142
20153
20163
20173
20180
Total1157