2015

5.4

2017

4.6

2002

5.1

2012

7.6

1997

6.6

1990

7.4

2001

7.6

2002

8.0

2005

7.0

2011

8.1

2009

7.6

2001

6.8

2014

7.1

1997

7.7

1995

6.3

1999

7.9

1998

7.1