*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19741
19750
19760
19770
19780
19790
19800
19810
19820
19833
19845
19851
198612
19873
19888
19897
19903
199121
19926
199334
199417
199546
19966
199710
19984
199979
20001
200110
200211
200311
20044
200518
20066
20071
20083
20090
201038
201153
201211
20134
20144
20151
20162
20171
20180
Total446