R help - Sep 2014 - ggplot y-axis labels are not continuous

Hi,

This is the code to create a ggplot. The plot is rendered but the y-axis
labels are not continuous. So the lines are split.

Moreover multiple y-axis labels overwrite each other due to this. How can I
fix this?

If I try to set ylim I get "

*Discrete value supplied to continuous scale"*

library(RJSONIO)
library(ggplot2)
this.dir <- dirname(parent.frame(2)$ofile)
setwd(this.dir)

airlines   = fromJSON("json")
df <- sapply(airlines$data,unlist)
df <- data.frame(t(df))
colnames(df) <- c( (airlines[[1]][[1]])[[2]],
gsub("[^A-Z]","",(airlines[[1]][[2]])[[2]]),
gsub("[^A-Z]","",(airlines[[1]][[3]])[[2]] ),
gsub("[^A-Z]","",(airlines[[1]][[4]])[[2]]),
(airlines[[1]][[5]])[[2]],
(airlines[[1]][[6]])[[2]], (airlines[[1]][[7]])[[2]],
(airlines[[1]][[8]])[[2]],
(airlines[[1]][[9]])[[2]],(airlines[[1]][[10]])[[2]] )

df.melted <- melt(df, id = "YEAR")
print(ggplot(data = df.melted, aes(x = YEAR, y = value, color = variable))
+geom_point() + theme(axis.text.x = element_text(angle = 90, hjust = 1)) +
ylab(""))
dev.off()

> head(df)
     YEAR INTERNATIONALACMINNOS DOMESTICACMINNOS TOTALACMINNOS

1 1995-96                 92515           314727        407242

2 1996-97                 94884           324462        419346

3 1997-98                 98226           317531        415757

4 1998-99                 99563           325392        424955

5 1999-00                 99701           368015        467716

6 2000-01                103211           386575        489786

  INTERNATIONAL PAX (IN NOS) DOMESTIC PAX (IN NOS) TOTAL PAX (IN NOS)

1                   11449756              25563998           37013754

2                   12223660              24276108           36499768

3                   12782769              23848833           36631602

4                   12916788              24072631           36989419

5                   13293027              25741521           39034548

6                   14009052              28017568           42026620

  INTERNATIONAL FREIGHT (IN MT) DOMESTIC FREIGHT (IN MT) TOTAL FREIGHT (IN
MT)

1                        452853                   196516
649369

2                        479088                   202122
681210

3                        488175                   217405
705580

4                        474660                   224490
699150

5                        531844                   265570
797414

6                        557772                   288373
846145


Thanks,

Mohan

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