1995

7.6

2006

7.8

2017

7.0

2007

6.1

2001

4.3

2005

7.5

1987

7.7

2015

5.1

2002

7.1

2005

6.3

1987

6.1

1996

8.0

1992

5.0

1999

5.0

2015

6.3

2018

6.0

1936

7.1

1997

3.5

1958

6.4

1970

5.0