2015

6.0

1996

5.3

2010

6.6

1990

6.0

2020

7.3

2012

5.6

2008

8.0

2006

6.1

2018

5.9

2021

4.7

1987

6.0

1989

5.7

2001

4.3

1975

6.4

1984

7.2

2009

6.2

1989

9.3

1942

7.0

2003

6.0

1990

5.7