2009

2010

2011

2012

2013

2014

Abnormal

1

1.220

1.558

2.137

3.188

4.300

Airline

1

1.205

1.368

1.952

2.800

3.878

Flow control

1

1.456

1.801

2.375

3.828

4.780

Weather

1

1.041

1.461

1.967

2.936

3.959

Others

1

1.177

1.958

2.670

3.851

5.554