*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19822
19831
19842
19850
19862
19872
19887
19890
199010
19919
199216
199330
199411
19954
19968
199720
19988
19995
20001
20014
200217
200314
20045
20050
20061
20074
20086
20091
20100
20118
20121
20131
20142
20151
20161
20170
Total205