2009

2010

2011

2012

2013

2014

Abnormal

322,601

393,502

502,459

689,274

1,028,507

1,387,139

Airline

135,921

163,821

185,942

265,370

380,547

527,112

Flow control

72,544

105,611

130,661

172,318

277,696

346,784

Weather

75,676

78,802

110,560

148,883

222,157

299,622

Others

38,460

45,268

75,296

102,703

148,107

213,621