*Excludes Observations that spanned multiple years

Pre 19708
19700
19710
19720
19731
19740
19752
19760
19770
19780
19790
19800
19810
19822
19830
19841
19853
19861
19871
198816
19894
19903
19915
19920
199327
19940
19954
19961
19971
19981
19998
200012
20019
20023
20032
20040
20050
20060
20072
20081
20090
20100
20110
20120
20131
20140
20151
20162
20170
20182
20192
20202
20213
20221
20230
Total132