delta %>%
filter(iso3c %in% c("CHN", "FRA", "DEU")) %>%
left_join(iso3c, by = "iso3c") %>%
ggplot(.) +
geom_line(aes(x = date, y = value, color = iso3c_desc, linetype = iso3c_desc)) +
theme_minimal() + scale_color_manual(values = viridis(4)[1:3]) +
theme(legend.title = element_blank(),
legend.position = c(0.2, 0.8)) +
scale_x_date(breaks = seq(1950, 2020, 5) %>% paste0("-01-01") %>% as.Date,
labels = date_format("%y")) +
scale_y_continuous(breaks = 0.01*seq(-60, 60, 0.5),
labels = scales::percent_format(accuracy = 0.1)) +
xlab("") + ylab("Average depreciation rate of the capital stock")