*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19729
19737
19740
19750
19760
19770
19780
19790
19801
19810
19820
19830
19845
19856
19863
198710
198888
198915
199069
1991142
1992125
19937
19940
19951
19960
199714
19980
199952
200040
200129
20022
20031
200432
20051
20060
20070
20089
20090
201024
201129
20120
20132
20143
20151
20163
20172
201811
20190
Total743