UFOs: Past, Present, and Future

7.6

/

1997

7.295

/

2009

5.5

/

2017

9.163

/

2023

6.554

/

2002

6.5

/

2024

5.8

/

2009

6.5

/

2023

8.794

/

1998

7

/

2016

6.644

/

2009

7.236

/

2010

6.161

/

2007

8.687

/

1972

6.335

/

2012

5.033

/

2012

6.67

/

2024

7.75

/

NaN

7.1

/

2021

5.41

/

2024