*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
19910
19920
19930
19940
19950
19961
19970
19985
19992
20000
20011
20020
20030
20041
20051
20060
20070
20080
20091
20100
20110
20121
20130
20140
20150
20160
20170
20180
20192
20200
20210
20222
20231
20240
Total21