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*Excludes Observations that spanned multiple years

Pre 19700
19700
19715
197267
197313
19741
19750
19760
19770
19782
19790
19802
19810
19820
19830
198424
198512
1986102
1987223
1988375
198983
199073
1991263
199299
1993148
199440
1995211
1996149
1997150
199816
199964
200044
200144
200229
20038
200422
20054
20062
20077
200811
20092
20103
201114
201216
201315
201412
201515
201611
20177
20181
20191
20200
20210
Total2390