*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19801
19810
19820
19830
19840
19850
19860
19870
19881
19890
19900
19911
19929
19937
199412
19956
19961
19970
19980
19993
20004
20011
20022
20030
20044
20050
20065
20071
20087
20092
20101
20111
20120
20137
20140
20150
20160
20170
20180
20192
20201
20216
20223
20234
20242
Total95