*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
197240
197318
19740
19750
19760
19770
19780
19790
19800
19810
19820
19831
19840
19855
19862
198724
198894
198943
199092
1991207
1992104
199376
19941
19956
19961
19971
19981
199956
200054
200144
20025
20033
200430
20054
20063
20070
20080
20090
20100
20111
20122
20134
20143
20150
20165
20171
20180
Total931