*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19940
19951
19961
19971
19980
19992
20000
20010
20020
2003520
2004504
2005268
200661
200723
200825
200924
2010500
20116
201229
201310
201447
201518
201644
20179
20180
20190
Total2093