2000

7.2

1997

7.8

2004

7.3

2010

4.4

1998

6.4

2011

7.3

2017

6.8

2016

6.9

2009

6.7

1988

5.9

1964

7.4

2016

5.8

1992

7.4

2017

6.6

2003

5.7

2014

7.2

2000

8.1

2015

6.6

2011

5.5

2001

5.9