*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19881
19890
19900
19911
19920
19930
19941
19950
19961
19970
19980
19992
20008
20010
20025
20031
20044
20050
20060
20070
200820
20098
20102
20110
20123
20132
20141
20150
20162
20170
20180
20190
20200
20210
20220
Total64