*Excludes Observations that spanned multiple years

Pre 197050
19700
19710
19720
19730
19741
19750
19762
19771
19786
19790
19800
19810
19820
19830
19842
19850
19862
19871
19880
19891
19900
19912
19922
19936
19943
19957
19961
19971
19984
19992
20000
20010
20020
20030
20042
20052
20061
20070
20081
20092
201036
201138
20122
20134
20143
20153
20164
20170
20184
20190
Total196