2013換題時間
換題日 ---間隔天數
01/03/2013 --- 28
01/31/2013 --- 28
03/02/2013 --- 30
04/06/2013 --- 35
05/06/2013 --- 30
06/06/2013 --- 31
07/13/2013 --- 37
08/16/2013 --- 34
09/12/2013 --- 27
10/11/2013 --- 29
11/08/2013 --- 28
12/08/2013 --- 30
平均天數 --- 30.6