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*Excludes Observations that spanned multiple years

Pre 19700
19700
19713
19721
19730
19740
19750
19760
19773
19780
19791
19800
19810
19820
19832
198422
198525
198658
198795
1988194
198941
199053
1991109
199250
199353
199410
1995154
199699
199785
19985
199976
200037
200134
200216
20039
20040
20054
20063
20073
20086
20092
20100
20115
20127
20138
20146
201513
201613
20174
20180
20190
20200
20210
Total1309