1990

6.5

2015

5.1

2010

7.0

1996

9.4

6.4

1993

5.4

2010

6.9

1976

5.9

2003

6.6

7.8

2021

6.2

2019

9.8

2019

6.5

2021

7.7

2007

7.7

2022

6.0

1921

5.0

2020

7.6

1968

7.2

2002

5.0