*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19855
19860
19872
198868
19890
199010
19910
199211
199335
19945
19955
19961
19970
19980
199944
200029
200129
200219
20034
20043
20050
200610
20074
20085
20097
20100
20112
20120
20131
20141
20150
20162
20171
20180
20194
20200
20210
20220
Total307