*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19831
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19940
19951
19960
19970
19980
19990
20000
20011
20022
20031
20044
20050
20060
20070
20081
20090
20100
20110
20122
20131
20143
20152
20160
20174
20184
20191
20203
20210
20220
20230
20240
Total32