1951

5.4

2015

6.8

1968

6.5

2008

7.6

2019

7.1

1999

4.4

2005

5.6

1966

6.4

1980

6.1

1995

6.9

2018

6.1

2021

6.6

1987

7.5

1972

7.2

2021

6.4

1977

6.3

2002

7.0

2003

6.9

2019

7.9

2010

5.9