*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19721
19731
19740
19751
19760
19770
19780
19790
19800
19815
19820
19831
19840
19850
19860
19870
19880
19890
19900
19912
19920
19930
19940
19952
19960
19973
19980
19990
20000
20010
20020
20031
20040
20050
20060
20070
20081
20090
20100
20110
20120
20131
20140
20150
20160
20170
20180
20190
20200
20210
20220
20230
20240
Total21