*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19811
19821
19831
19842
19851
19867
198713
198813
198910
19909
19917
199220
19939
19948
199538
19961
19979
19981
19997
20003
200110
200215
20036
20043
200526
20066
20077
200810
20091
20100
201113
20120
20130
20140
20152
20169
20171
20181
Total274