*Excludes Observations that spanned multiple years

Pre 197011
19700
19711
19720
19730
19740
19752
19760
19770
19783
19790
19801
19810
19820
19830
19840
19850
19861
19872
198826
19894
19902
199115
19928
199314
19943
19958
19964
19974
19982
199924
200017
20011
20020
20031
20042
20050
20061
20075
20087
200910
20104
201110
20120
20131
20143
20153
201611
20177
201810
201924
202029
202168
202233
202376
202423
Total481