Barplot - 堆叠 ggplot 百分比 barplot 起始值不是 0%

问：

我有一个这样的情节：

library(ggplot2)
library(reshape2)
library(ggh4x)

data <- data.frame(col1=c("Sample1","Sample2","Sample3","Sample4","Sample5","Sample6"),
                    col2=c(0.5,0.1,0.4,0.05,0.05,0.9),
                    col3=c(0.6,0.1,0.3,0.1,0.1,0.8),
                    col4=c(0.5,0.3,0.2,0.05,0.15,0.8),
                    col5=c("a","a","a","b","b","b"),
                    col6=c("c","c","c","c","c","c"))

data2 <- melt(data)

ggplot(data=data2, aes(x = variable, y = value, fill=col1))+
  geom_bar(position="stack", stat="identity")+
  scale_fill_manual(values=c("#e6194B","#ffe119","#f58231","#911eb4","#42d4f4","#bfef45")) +
  scale_y_continuous(expand = c(0, 0),labels = scales::percent) +
  facet_nested(~col6 + ~col5, scales = "free_x",space = "free_x",switch = "x") +
  ggtitle("Title") +
  theme_classic() +
  theme(strip.text.y = element_text(angle=0),legend.position = "right",
        legend.key.size = unit(0.4, 'cm'),
        axis.line = element_line(colour = "black"),
        axis.text.x = element_text(angle = 90, vjust = 0.5, hjust=1),
        strip.placement = "outside",                      
        strip.background = element_rect(color = "white", fill = "white"),
        axis.title = element_blank()) +                  
  guides(fill=guide_legend(title=NULL, ncol = 1)) +
  xlab("X axis") +
  ylab("Y axis")

这将创建这样的条形图：请看一下

我的问题很简单，如何将 y 轴起始值设置为 10% 而不是 0%（不对代码进行太多更改）。非常感谢所有答案！（检查了类似的问题，没有成功......