*Excludes Observations that spanned multiple years

Pre 197016
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19861
19870
19880
19890
19900
19910
19920
199310
19940
19953
19960
19970
19980
19990
20000
20010
20020
20031
20041
200515
200622
20075
20085
200921
201046
201119
201213
201326
201445
201521
20166
20170
20181
20191
20200
20210
20220
20230
Total278