2014

6.7

2005

5.2

1989

5.6

2014

7.2

1990

6.6

1998

4.8

2008

5.7

1990

7.2

1994

4.2

1996

4.7

2012

7.1

1978

5.9

1999

4.6

2013

6.2

1988

6.3

1953

5.9

1980

6.0

2006

6.3

1959

6.1

1980

6.5