*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19731
19741
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19902
19914
199217
19931
19941
19951
19962
199711
199810
199914
20004
20010
20024
20031
200413
200523
20060
20075
20082
20099
20100
20110
20120
20130
20140
20150
20160
20170
Total128