*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19872
198810
19892
19904
199115
199240
199327
199412
19957
19960
19970
19981
19990
20002
20013
20021
20032
20046
20051
20067
20077
200813
200919
201020
20119
20126
201327
201412
20157
201623
201713
201810
20194
20207
20216
20228
20231
20240
Total336