1992

7.4

2006

7.4

1998

7.1

2007

6.6

2018

5.6

1976

5.1

1973

6.7

1964

7.2

2021

7.8

2014

6.1

1999

6.4

2020

5.2

1979

5.1

1978

6.0

2017

2.0

1978

4.2

2018

6.4

1990

5.0

2013

4.8

2017

6.6