*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19840
19853
19861
19870
19881
19893
19900
19913
19921
19930
19943
199515
199615
19970
19980
19992
20000
20011
20023
20031
20040
20052
20060
20077
20082
20090
20100
20111
20120
20132
20140
20150
20160
20171
20184
20190
20200
20211
20221
20231
Total76