That's a great stat, proving once and for all that Federer actually improved with age during the teens, contrary to the mantra coming from Fedfans.
Without Djokovic, he without a doubt would be the no. 1 player in the world the last 5 years. Remember he's 6-1 against Nadal since '15.
it's not Djokovic who prevented Fed to dominate the tour since '15.
just count how often he lost in early rounds.
Novak defeated him in most important matches, but even without Novak, Stefanos at AO, Millman or Dimitrov at USO, Rublev in Cincinnati and many other occasions where at times Novak was eliminated, so the draw opened up, and yet Roger went home without title and with little points.
so, it is impossible to deny the aging factor.
AO'15 lost to Seppi in R3
Dubai'15 defeated Novak in F
IW'15 lost to Novak in F
MC'15 lost to Monfils in R3
Madrid'15 lost to NK in R2
Rome'15 lost to Novak in F
RG'15 lost to Wawrinka in QF
W'15 lost to Novak in F
Cincinnati'15 defeated Novak in F
USO'15 lost to Novak in F
Shanghai'15 lost to Ramos-Vinolas in R2
Paris'15 lost to Isner in R3
London '15 defeated Novak in group phase and lost in the final
Brisbane'16 lost to Raonic in F
AO'16 lost to Novak in F
MC'16 lost to Tsonga in QF
Rome'16 lost to Thiem in R3
Stuttgart'16 lost to Thiem in SF
Halle'16 lost to Zverev in SF
W'16 lost to Raonic in SF
Dubai'17 lost to Donskoy in R2
Stuttgart'17 lost to Haas in R2
Montreal'17 lost to Zverev in F
USO'17 lost to Del Potro in QF
London'17 lost to Goffin in SF
IW'18 lost to Del Potro in F
Miami'18 lost to Kokkinakkis in R2
Halle'18 lost to Coric in F
W'18 lost to Anderson in QF
Cincinnati'18 lost to Novak in F
USO'18 lost to Millman in R16
Shanghai'18 lost to Coric in SF
Paris'18 lost to Novak in SF
London'18 lost to Nishikori in groups and then to Zverev in SF
AO'19 lost to Stefanos in R16
IW'19 lost to Thiem in F
Madrid'19 lost to Thiem in QF
Rome'19 lost to Stefanos in QF
RG'19 lost to Nadal in SF
W'19 lost to Novak in F
Cincinnati'19 lost to Rublev in R16
USO'19 lost to Dimitrov in QF
Shanghai'19 lost to Zverev in QF
London'19 lost to Thiem in groups, defeated Novak in groups, lost to Stefanos in SF