1971

6.8

2021

5.5

2006

9.8

2015

6.8

2010

6.3

2014

6.4

2013

6.1

1987

6.9

1984

6.7

2005

5.8

2017

6.0

2010

3.9

2015

6.4

2018

7.7

1992

10.0

1979

5.8

1964

8.1

2021

7.0

1971

5.5

1985

6.8