*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19853
19860
19870
19880
19890
19900
19911
19922
19933
19940
19952
19960
19970
19980
19999
20000
20011
20024
20031
20040
20056
20060
20071
20087
20090
20100
20110
20122
20131
20144
20153
20164
20171
20180
Total55