1991

5.9

2015

4.6

2014

6.0

1985

5.3

2011

7.3

2006

6.3

2001

9.9

1997

5.4

2009

8.5

2015

3.7

2011

7.1

2002

6.1

1986

7.6

1951

5.8

2021

10.0

2013

8.1

2015

5.5

1973

6.2

1990

7.5

1989

6.1