年份,目擊個體數,校正後個體數
2008,64,65
2009,63,66
2010,69,69
2011,66,68
2012,62,67
2013,66,66
2014,60,65
2015,60,65
2016,65,65
2017,58,59
2018,51,
2019,47,
2020,32,