*Excludes Observations that spanned multiple years

Pre 19703
19700
19710
19720
19730
19740
19750
19761
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19905
19916
19920
19930
19943
199513
19962
19971
19981
19990
20000
20010
20020
20030
20041
20051
20061
20070
20084
200919
201067
201127
201222
201315
201420
201513
201610
20172
20180
20190
20200
20211
20222
20230
20240
Total240