2014

6.5

2003

5.8

2010

4.8

2002

10.0

2013

6.7

2000

5.5

1984

6.1

1993

6.2

2007

5.6

1990

6.9

1998

6.7

2016

7.2

2016

5.3

2011

9.7

2001

6.6

6.0

1973

7.5

1979

6.1

1969

7.0

1968

6.9