{frame_time} gganimate should not show decimals

Hi gganimators! I produced a gganimate plot using the following code below.

Note that year is loaded as double but in fact it is an integer (no decimals). When using {frame_time} within labs I would like to have it showing only integers, not all those decimals. How to fix it? I tried to fix it by transforming year to factor, but then the animation was jumping across frames, not smoothly moving. Also round() dit not work within frame_time.

tebu %>%
    group_by(year, location, state, efficacy) %>%
  summarise(mean_efficacy = mean(efficacy)) %>%
  filter(mean_efficacy > 0) %>%
  ggplot(aes(year, mean_efficacy, 
         size = mean_efficacy, 
         color = mean_efficacy)) + 
  geom_jitter() +
  scale_color_viridis() +
  transition_time(year) +
 shadow_trail(max_frames = 5) +
    title = "Effect of tebuconazole for controling soybean rust in Brazil",
    subtitle = "Year: {frame_time)}", 
    x = "Harvest year", 
    y = "Control efficacy (%)", 
    caption = "Del Ponte et al. (unpublished)"
  ) +
  theme(legend.position = "none",
        axis.text.x = element_text(angle = 45, hjust = 1)) +


I think subtitle = "Year: round({frame_time})" should work.

Nope. Can't have a function there.

But I just figure it out!

transition_time(as.integer(year)) +


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