No

Year

Proton mass ´ 1027, kg

Achieved relative uncertainty

References

1

1999

1.6726217161

4.6 × 10 7

[9]

2

2005

1.6726217129

1.7 × 10 7

[10]

3

2008

1.6726216378

5 × 10 8

[11]

4

2008

1.6726217162

1.8 × 10 10

[12]

5

2012

1.6726217777

4.4 × 10 8

[13]

6

2014

1.6726218982

1.2 × 10 8

[14]

7

2017

1.6726217154

3.2 × 10 11

[15]